STRENUOUS

[stren.u.ous] adj [L strenuus] (1599) 1 a: vigorously active: energetic b: fervent, zealous

2: marked by or calling for energy or stamina: arduous syn see vigorous -- stren.u.os.i.ty n -- stren.u.ous.ly adv -- stren.u.ous.ness n